10-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Overcast
12°
Feels like 12°
Wind↑ NNW 22 km/h
Gusts30 km/h
Humidity 45 %
Afternoon
Clear sky
15°
Feels like 15°
Wind↑ SE 10 km/h
Humidity 36 %
11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Partly cloudy
12°
Feels like 12°
Wind↑ NNW 16 km/h
Humidity 45 %
Afternoon
Clear sky
18°
Feels like 18°
Wind↑ ESE 2 km/h
Humidity 34 %
12-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Partly cloudy
14°
Feels like 14°
Wind↑ NNW 13 km/h
Humidity 48 %
Afternoon
Partly cloudy
19°
Feels like 19°
Wind↑ NW 2 km/h
Humidity 41 %
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Clear sky
15°
Feels like 15°
Wind↑ NNW 12 km/h
Gusts22 km/h
Humidity 48 %
Afternoon
Clear sky
21°
Feels like 21°
Wind↑ NE 11 km/h
Humidity 20 %
Kawaguchi forecast in charts · next 7 days
The week ahead: highs and lows
≈ A week close to the usual temperatures
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Kawaguchi climate: what a normal year looks like
The hottest stretch is August, when afternoons average 31 °C; the coldest is January, when nights average 1 °C. Between those two months the average temperature changes by 23 °C.
Typical highs of 30 °C or more are reached in August only, at 31 °C.
From 14 h 35 min of daylight in late June to 9 h 43 min in late December.
A normal year brings roughly 1,500 mm of rain — more than 75% of the towns of 20,000+ people we compared it with.
Forecast highs for the coming week average 19 °C, 2 °C cooler than a normal October (21 °C).
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
9 °C
1 °C
68 mm
Feb
10 °C
2 °C
67 mm
Mar
13 °C
5 °C
111 mm
Apr
18 °C
10 °C
116 mm
May
23 °C
15 °C
135 mm
Jun
25 °C
19 °C
167 mm
Jul
30 °C
24 °C
159 mm
Aug
31 °C
25 °C
124 mm
Sep
27 °C
21 °C
191 mm
Oct
21 °C
15 °C
207 mm
Nov
17 °C
9 °C
90 mm
Dec
12 °C
3 °C
59 mm
Whole year
20 °C
12 °C
1,500 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 35.81° N, 139.71° E, 1991–2020. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.
Air you breathe in Kawaguchi: pollution and pollen
1/6
Good
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.55µg/m³
PM105µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around Kawaguchi
Rain observed over the last two hours by official weather radars around Kawaguchi, followed by the radar forecast for the next hour where the weather service provides one.
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Rain radarLast two hours, then forecast where available · drag the timeline
No open weather radar covers Kawaguchi yet: the map shows our hour-by-hour rain forecast (ICON, GFS).
Moon over Kawaguchi
Waning gibbous
79 % illuminated · 19.3 days
Rise 14:58 Set 05:29
Sat31/1069%
Sun1/1159%
Mon2/1149%Last quarter
Tue3/1138%
Wed4/1128%
Thu5/1119%
Fri6/1112%
Sat7/116%
Sun8/112%
Mon9/110%
Tue10/111%New moon
Wed11/113%
Moonrise and moonset in local time (Asia/Tokyo); phase and lit fraction from a synodic calculation.
Look up a past day in Kawaguchi
Curious about the weather in Kawaguchi on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Kawaguchi weather at a glance
This page gathers everything about the weather in Kawaguchi, Saitama: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “partly cloudy”, it is 13 °C (feels like 13 °C) and the wind blows at 9 km/h.
Expected range today: 13 °C to 21 °C and a dry sky. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms.
Use the Kawaguchi forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.
